A muon formed high in Earth's atmosphere travels at speed v = 0.92c for a distance of 4.3 km before it decays into an electron, a neutrino, and an antineutrino (µ- e- + v + v).
(a) How long does the muon live, as measured in its reference frame?
_________ µs
(b) How far does the muon travel, as measured in its frame?
_________ km